A manager uses a trend equation plus quarterly relatives to predict demand. Quarter relatives are $S{R}_1=0\mathrm{.}9,S{R}_2=0\mathrm{.}95,S{R}_3=1\mathrm{.}05,$ and $S{R}_4=1\mathrm{.}1.$ The trend equation is: $F_t=8+4t.$ Over the past nine quarters, demand has been as follows:

$\backslash$table$[[$Period$,t$:$,1,2,3,4,5,6,7,8,9],[$Demand:$,11,16,19,25,28,32,35,38,44]]$

Click here for the Excel Data File

Compute the MAD and tracking signal for each period.

Note: Negative values should be indicated by a minus sign. Round your intermediate calculations and final answers to $3$ decimal places.

$\backslash$table$[[$Period$,t,$Demand,MAD,Tracking signal$],[1,11,,],[2,16,,],[3,19,,],[4,25,,],[5,28,,],[6,32,,],[7,35,,],[8,38,,],[9,44,,]]$